chore: import upstream snapshot with attribution

.github/workflows/test_js.yml

@@ -0,0 +1,47 @@
+# Ensure that the javascript package can be built with webpack
+# Runs on any PRs that modify the javascript directory
+# Also verifies that the built bundle matches the committed bundle
+
+name: test_js
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+    paths:
+      - "javascript/**"
+
+jobs:
+  build-js:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v3
+      with:
+        node-version: lts/Hydrogen
+    - run: npm ci
+      working-directory: ./javascript
+    - run: npm run build
+      working-directory: ./javascript
+    - run: npm run test
+      working-directory: ./javascript
+
+    # Check if the built bundle matches the committed bundle (ignoring whitespace)
+    - name: Compare built bundle with committed bundle
+      run: |
+        # Normalize whitespace in both files for comparison
+        # Remove empty lines and all whitespace, then compare
+        sed '/^[[:space:]]*$/d; s/[[:space:]]//g' javascript/build/bundle.js | tr -d '\n' > /tmp/new_bundle_normalized.js
+        sed '/^[[:space:]]*$/d; s/[[:space:]]//g' shap/plots/resources/bundle.js | tr -d '\n' > /tmp/committed_bundle_normalized.js
+
+        if diff -q /tmp/new_bundle_normalized.js /tmp/committed_bundle_normalized.js > /dev/null; then
+          echo "✅ Bundle matches the committed version"
+        else
+          echo "❌ Built bundle differs from committed version"
+          echo "The bundle.js file needs to be updated."
+          echo "Run: cd javascript && npm run build && cp build/bundle.js ../shap/plots/resources/bundle.js"
+          exit 1
+        fi